CN111474474A - Method for improving testing precision of rotary transformer static zero position of motor - Google Patents
Method for improving testing precision of rotary transformer static zero position of motor Download PDFInfo
- Publication number
- CN111474474A CN111474474A CN202010192083.4A CN202010192083A CN111474474A CN 111474474 A CN111474474 A CN 111474474A CN 202010192083 A CN202010192083 A CN 202010192083A CN 111474474 A CN111474474 A CN 111474474A
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- motor
- rotor
- motor rotor
- zero point
- angle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
Abstract
The invention relates to the technical field of motor tests, in particular to a method for improving the testing precision of a rotary transformer static zero position of a motor. And introducing direct current to the motor assembly to be tested to enable the motor rotor of the motor assembly to return to the zero point, applying clockwise or anticlockwise rotating acting force to the motor rotor to force the motor rotor to rotate around the shaft, removing the rotating acting force to enable the motor rotor to return to the zero point, completing the first operation, applying reverse rotating acting force to the motor rotor according to the steps to perform the second operation, recording the rotation angle of the rotation-change rotor after two operations, and calculating the final zero point angle through the rotation angle of the two times. The measuring method described by the invention can obviously improve the testing precision of the static zero point of the rotary transformer.
Description
Technical Field
The invention relates to the technical field of motor tests, in particular to a method for improving the testing precision of a rotary transformer static zero position of a motor.
Background
The permanent magnet synchronous motor comprises a motor stator and a motor rotor, and also comprises a rotary transformation part, wherein the rotary transformation part comprises a rotary transformation stator and a rotary transformation rotor, the rotary transformation rotor is arranged on the motor rotor, the rotary transformation rotor also rotates when the motor rotor rotates, and the motor stator and the rotary transformation stator are both arranged on a shell and are stationary, so that the relative angle between the motor stator and the motor rotor (hereinafter referred to as the motor stator and rotor angle) and the relative angle between the rotary transformation stator and the rotary transformation rotor (hereinafter referred to as the rotary transformation angle) are unchanged at any moment.
The permanent magnet synchronous motor generates a magnetic field by giving alternating current to a motor stator so as to push a motor rotor to rotate. However, the motor needs to provide corresponding current for the motor stator according to the relative angle of the motor stator and the motor rotor and generate a corresponding magnetic field, so that the rotating speed and the rotating direction of the motor rotor are controlled, and therefore the motor needs to acquire an angle signal of the motor rotor, and therefore the motor has rotary deformation.
The rotary transformer stator can read the position signal of the rotary transformer rotor at any time and calculate the angle of the rotary transformer rotor, namely the rotary transformer angle. If the relation between the initial motor stator and rotor angle and the rotary variable angle can be measured, the motor stator and rotor angle can be obtained at any time according to the rotary variable angle, and therefore the rotating speed and the rotating direction of the motor rotor are accurately controlled. The purpose of the rotation zero point test is to measure the angle difference between the stator and rotor angles of the motor and the rotation angle. The rotation zero point refers to the relationship between the rotation angle and the angle of the stator and the rotor of the motor.
The current methods for testing the rotary zero of the motor mainly include dynamic testing and static testing. During dynamic testing, pull electric motor rotor through external force for the motor is at the uniform velocity rotatory, and wherein circuit and motor stator three-phase line are connected all the way, and signals such as the wave form of detectable back electromotive force connect rotary transformer all the way in addition, can calculate except that the signal of rotary angle through rotary transformer's output signal, and the signal of contrast back electromotive force can record the relation of rotary angle and motor stator rotor angle, is the rotary zero position of motor promptly. The method has high measurement accuracy, but has a complex structure. During static test, one circuit is connected with three phase lines of a motor stator, certain direct current is input, the motor rotor automatically returns to a zero point, the other circuit is connected with a rotary transformer, a rotary angle signal can be calculated through an output signal of the rotary transformer, and the rotary angle at the moment is a generalized rotary zero point position because the motor rotor already returns to the zero point. The rotational angle calculated by the signals measured by the rotational stator is the difference between the rotational angle and the angle of the stator and the rotor of the motor. The method is simple, but the motor rotor cannot really return to the zero point due to the adverse factors such as friction force, cogging torque and the like, and certain deviation inevitably exists, the deviation is reduced along with the increase of the current of the electrified direct current, but the deviation is limited by the maximum bearable current of the motor and is larger.
Disclosure of Invention
The invention aims to solve the technical problems mentioned in the background art and provide a method for improving the testing precision of the rotary transformer static zero position of a motor.
The technical scheme of the invention is as follows: a method for improving the testing precision of the rotary transformer static zero position of a motor is characterized by comprising the following steps: and introducing direct current to the motor assembly to be tested to enable the motor rotor of the motor assembly to return to the zero point, applying clockwise or anticlockwise rotating acting force to the motor rotor to force the motor rotor to rotate around the shaft, removing the rotating acting force to enable the motor rotor to return to the zero point, completing the first operation, applying reverse rotating acting force to the motor rotor according to the steps to perform the second operation, recording the rotation angle of the rotation-change rotor after two operations, and calculating the final zero point angle through the rotation angle of the two times.
Further, clockwise or anticlockwise rotating acting force is applied to the motor rotor to force the motor rotor to rotate around the shaft by an angle B1, the rotating acting force is removed to enable the motor rotor to return to a zero point, a rotation angle analysis instrument calculates a rotation angle A1 of the rotation rotor fixedly connected with the motor rotor, then reverse rotating acting force is applied to the motor rotor to force the motor rotor to rotate reversely by an angle B2, reverse acting force is removed to enable the motor rotor to return to the zero point, the rotation angle analysis instrument calculates a rotation angle A2 of the rotation rotor, and finally the measured zero point angle is an average value 1/2 (A1+ A2) of two measurement results.
Further both B1 and B2 are greater than the deviation value of the motor assembly in the static zero test.
Further the B1 is equal to B2 or B1 is not equal to B2.
During actual measurement, when the motor rotor returns to the zero point clockwise, the actual position of the motor rotor is on the counterclockwise side of the actual zero point due to the tooth space moment, the friction force and other factors of the motor assembly, and when the motor rotor returns to the zero point counterclockwise, the actual position of the motor rotor is on the clockwise side of the actual zero point due to the tooth space moment, the friction force and other factors. Therefore, through rotation recovery in two directions, the influence of the two tests on the test result of the angle of the rotation zero point is positive, negative and theoretically equal in absolute value. The accuracy of the zero point is thus significantly improved by averaging the two measurements.
Drawings
FIG. 1: the motor assembly is connected with a direct current power supply and a rotation angle analysis instrument in a schematic mode;
wherein: 1-a direct current power supply; 2-three phase line; 3, three-phase outgoing copper bars of the motor stator; 4-a rotary transformer rotor; 5-a rotary variable stator; 6-a rotary signal connecting line; 7-rotation angle analyzer; 8, a motor rotor; 9-motor assembly.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, the motor assembly 9 of the present embodiment includes a rotary transformer rotor 4, a rotary transformer stator 5, a motor rotor 8, a motor housing, a motor stator, and the like, the rotary transformer rotor 4 is fixed on the motor rotor 8, and the whole of the rotary transformer rotor 4 and the motor rotor 8 is rotatable around the axis of the motor rotor 8. During actual measurement, the direct-current power supply 1 is connected with the motor assembly 9 through the three-phase line 2, one end of the three-phase line 2 is connected with the direct-current power supply 1, and the other end of the three-phase line is connected with the motor assembly 9 through the three-phase appearance copper bar 3 of the motor stator. The rotation stator 5 of the motor assembly 9 is connected with a rotation angle analyzer 7 through a rotation signal connection wire 6.
The measurement is started, direct current is introduced into the motor assembly 9 through the direct current power supply 1 to enable the motor rotor 8 of the motor assembly 9 to return to a zero point, clockwise or anticlockwise rotating acting force is applied to the motor rotor 8 to force the motor rotor 8 to rotate around the shaft by an angle B1, the rotating acting force is removed to enable the motor rotor 8 to return to the zero point, the rotating rotor 4 and the motor rotor 8 are kept relatively static in the whole process, the rotating angle analyzer 7 calculates and records the rotating angle A1 of the rotating rotor 4 according to signals of the rotating stator received at the moment, the angle is a generalized rotating zero point position, due to the existence of adverse factors such as friction cogging torque, the motor rotor 8 does not actually return to the true zero point, and the angle A1 has a certain deviation from the actual zero point position A0. And applying a reverse rotation acting force to the motor rotor 8 to force the motor rotor 8 to rotate reversely by an angle B2, removing the reverse acting force to restore the motor rotor 8 to a zero point, calculating by the rotation angle analyzer 7 to obtain a rotation angle A2 of the rotor 4, and finally measuring the zero point angle as an average value 1/2 (A1+ A2) of the two measurement results.
Both B1 and B2 are larger than the deviation value of the motor assembly in the static zero point test, and B1 and B2 may be equal or unequal, as long as the rotation directions of the motor rotor 8 at the zero point twice are different.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A method for improving the testing precision of the rotary transformer static zero position of a motor is characterized by comprising the following steps: and introducing direct current into the motor assembly (9) to be tested to enable the motor rotor (8) of the motor assembly (9) to return to a zero point, applying clockwise or anticlockwise rotating acting force to the motor rotor (8) to force the motor rotor (8) to rotate around the shaft, removing the rotating acting force to enable the motor rotor (8) to return to the zero point, finishing the first operation, applying reverse rotating acting force to the motor rotor (8) according to the steps to perform the second operation, recording the rotation angle of the rotation-change rotor (4) of the two operations, and calculating the final zero point angle through the rotation-change angle of the two operations.
2. The method for improving the testing accuracy of the rotary transformer static zero position of the motor according to claim 1, wherein the method comprises the following steps: applying clockwise or anticlockwise rotating acting force to the motor rotor (8) to force the motor rotor (8) to rotate by an angle B1 around the shaft, removing the rotating acting force to enable the motor rotor (8) to return to a zero point, calculating by the rotation angle analysis instrument (7) to obtain a rotation angle A1 of the rotation angle rotor (4) fixedly connected with the motor rotor (8), applying reverse rotating acting force to the motor rotor (8) to force the motor rotor (8) to rotate reversely by an angle B2, removing the reverse acting force to enable the motor rotor (8) to return to the zero point, calculating by the rotation angle analysis instrument (7) to obtain a rotation angle A2 of the rotation angle rotor (4), and finally measuring the zero point angle to be an average value 1/2 x (A1+ A2) of two measurement results.
3. The method for improving the testing accuracy of the rotary transformer static zero position of the motor according to claim 2, wherein the method comprises the following steps: the B1 and the B2 are both larger than the deviation value of the motor assembly in the static zero point test.
4. A method for improving the accuracy of testing the position of the rotary-change static zero point of the motor according to claim 2 or 3, wherein: the B1 is equal to B2 or B1 is not equal to B2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010192083.4A CN111474474A (en) | 2020-03-18 | 2020-03-18 | Method for improving testing precision of rotary transformer static zero position of motor |
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| CN202010192083.4A CN111474474A (en) | 2020-03-18 | 2020-03-18 | Method for improving testing precision of rotary transformer static zero position of motor |
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| CN111474474A true CN111474474A (en) | 2020-07-31 |
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| CN202010192083.4A Pending CN111474474A (en) | 2020-03-18 | 2020-03-18 | Method for improving testing precision of rotary transformer static zero position of motor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198937A (en) * | 2014-08-26 | 2014-12-10 | 北京精密机电控制设备研究所 | Testing method of electrical zero position of randomly mounted brushless DC (Direct Current) motor of rotary transformer |
| CN107404272A (en) * | 2016-05-16 | 2017-11-28 | 广州汽车集团股份有限公司 | Permagnetic synchronous motor rotation becomes zero-bit initial angle scaling method and calibration system |
| CN107883990A (en) * | 2017-10-11 | 2018-04-06 | 广州汽车集团股份有限公司 | Over Electric Motor with PMSM rotary transformer Zero positioning method and system |
| CN109239635A (en) * | 2018-09-30 | 2019-01-18 | 合肥巨动力系统有限公司 | A kind of rotation of permanent magnet synchronous motor becomes Zero positioning system and scaling method |
| CN109921574A (en) * | 2019-03-29 | 2019-06-21 | 安徽安凯汽车股份有限公司 | A kind of the rotation change zero-bit debugging apparatus and method of permanent magnet synchronous motor |
| CN110365270A (en) * | 2018-12-25 | 2019-10-22 | 格至控智能动力科技（上海）有限公司 | Rotation for AC magnetoelectric machine becomes zero bias setting method |
-
2020
- 2020-03-18 CN CN202010192083.4A patent/CN111474474A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198937A (en) * | 2014-08-26 | 2014-12-10 | 北京精密机电控制设备研究所 | Testing method of electrical zero position of randomly mounted brushless DC (Direct Current) motor of rotary transformer |
| CN107404272A (en) * | 2016-05-16 | 2017-11-28 | 广州汽车集团股份有限公司 | Permagnetic synchronous motor rotation becomes zero-bit initial angle scaling method and calibration system |
| CN107883990A (en) * | 2017-10-11 | 2018-04-06 | 广州汽车集团股份有限公司 | Over Electric Motor with PMSM rotary transformer Zero positioning method and system |
| CN109239635A (en) * | 2018-09-30 | 2019-01-18 | 合肥巨动力系统有限公司 | A kind of rotation of permanent magnet synchronous motor becomes Zero positioning system and scaling method |
| CN110365270A (en) * | 2018-12-25 | 2019-10-22 | 格至控智能动力科技（上海）有限公司 | Rotation for AC magnetoelectric machine becomes zero bias setting method |
| CN109921574A (en) * | 2019-03-29 | 2019-06-21 | 安徽安凯汽车股份有限公司 | A kind of the rotation change zero-bit debugging apparatus and method of permanent magnet synchronous motor |
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Application publication date: 20200731 |